[PATCH v3 RESEND] staging: erofs: fix an error handling in erofs_readdir()

[Richard Weinberger]

----- Ursprüngliche Mail -----
> changelog from v2:
> - transform EIO to EFSCORRUPTED as suggested by Matthew;

erofs does not define EFSCORRUPTED, so the build fails.
At least on Linus' tree as of today.

Thanks,
//richard